Sudoku
Classic 9×9 logic, rated by the techniques a puzzle actually needs.
How to play
Fill every row, column, and 3×3 box with the numbers 1 through 9, with no repeats anywhere. Use notes to track which numbers could still go in a cell, and ask for a hint if you're stuck — it always reveals a cell you were close to working out yourself.
About Sudoku
Every one of the 800 puzzles in this build was generated, solved, and difficulty-rated by the actual logic techniques it takes to crack it — singles, pairs, pointing pairs, box-line reduction, and X-Wing — not by how many starting numbers it has. Four difficulty tiers mean Easy really does only ever need the simplest technique, and Expert really does need all of them.
A daily challenge gives everyone the same medium puzzle each day, with a streak tracker to keep you coming back. Undo is unlimited, and a configurable mistake limit (three by default, three strikes and you're offered a watch-an-ad second chance) keeps the pressure where you want it.
Features and highlights
- Four difficulty tiers, each rated by the real solving technique it takes, not clue count.
- 800 hand-verified puzzles, every one with a single unique solution.
- Notes with auto-clear as you fill in numbers around them.
- A daily challenge with its own streak, the same puzzle for everyone.
- Unlimited undo and a configurable mistake limit.
